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REVIEW article

Front. Oncol., 02 October 2020
Sec. Cancer Molecular Targets and Therapeutics

MicroRNA-24 in Cancer: A Double Side Medal With Opposite Properties

\nSumei Wang,,
&#x;Sumei Wang1,2,3*Nayan Liu,,,&#x;Nayan Liu1,2,3,4Qing Tang,,Qing Tang1,2,3Honghao Sheng,,Honghao Sheng1,2,3Shunqin Long,,
&#x;Shunqin Long1,2,3*Wanyin Wu,,
&#x;Wanyin Wu1,2,3*
  • 1Department of Oncology, Clinical and Basic Research Team of Traditional Chinese Medicine Prevention and Treatment of Non-Small Cell Lung Cancer, The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou, China
  • 2Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
  • 3Guangdong Provincial Key Laboratory of Clinical Research on Traditional Chinese Medicine Syndrome, Guangzhou, China
  • 4Guangdong Pharmaceutical University, Guangzhou, China

MicroRNA-24 (miR-24) has been widely studied in a variety of human cancers, which plays different roles in specific type of cancers. In the present review, we summarized the recent surveys regarding the role of miR-24 in different human cancers. On the one hand, miR-24 was reported to be down-regulated in some types of cancer, indicating its role as a tumor suppressor. On the other hand, it has shown that miR-24 was up-regulated in some other types of cancer, even in the same type of cancer, suggesting the role of miR-24 being as an oncogene. Firstly, miR-24 was dysregualted in human cancers, which is related to the clinical performance of cancer patients. Thus miR-24 could be used as a potential non-invasive diagnostic marker in human cancers. Secondly, miR-24 was associated with the tumor initiation and progression, being as a promoter or inhibitor. Therefore, miR-24 might be an effective prognostic biomarker in different type of cancers. Lastly, the abnormal expression of miR-24 was involved in the chemo- and radio- therapies of cancer patients, indicating the role of miR-24 being as a predictive biomarker to cancer treatment. Totally, miR-24 contributes to tumorigenesis, tumor progression, and tumor therapy, which closely related to clinic. The present review shows that miR-24 plays a double role in human cancers and provides plenty of evidences to apply miR-24 as a potential novel therapeutic target in treating human cancers.

Introduction

MicroRNAs (miRNAs) are an evolutionarily conserved family of endogenous 19-22nt long non-coding RNAs, which are related with post-transcriptional regulation of gene expression by cleaving the target mRNAs or repressing translation (1). More and more evidences proved that miRNAs contributed to the initiation and progression of many diseases, including cancer. In the year 2002, the first relation between cancer and miRNA deregulation was demonstrated. Since then, a variety of surveys about miRNAs in different human cancers have been performed, showing miRNAs can be used as effective markers and as novel therapeutic targets in human cancers (2). For example, dysregulation of miRNAs has been widely involved in the activation of oncogenes in hepatocellular carcinoma (HCC), showing the potential diagnostic and therapeutic value of miRNAs in HCC (3). MiRNA dysregulation is a causal factor in many cancers, suppressing or promoting the initiation and progression of human cancers. Moreover, miRNA mimics and inhibitors that target miRNAs are promising in pre-clinical development, and several miRNA-targeted therapeutics have reached clinical development (4). Insights into the roles of miRNAs in human cancers have made miRNAs attractive tools and targets for novel therapeutic approaches.

According to many reports, microRNA-24 (miR-24) is associated with human cancer. The human miR-24 is located at chromosome 19 of the human genome and transcribed as a part of miR-23a-27a-24-2 cluster (5). Dysregulation of miR-24 has been reported in various human cancers, such as non-small cell lung cancer (NSCLC) (6), hepatocellular carcinoma (HCC) (7), breast cancer (BC) (8), nasopharyngeal carcinoma (NPC) (9), colorectal cancer (CRC) (10), laryngeal squamous cell carcinoma (LSCC) (11), and esophageal squamous cell carcinoma (ESCC) (12). In NSCLC, miR-24 functioned as an oncogene by targeting WWOX (WW domain-containing oxidoreductase), leading to the inhibition of NSCLC cell apoptosis by inactivating caspase-3 and the promotion of NSCLC cell growth and proliferation (13). Another study also reported that miR-24 was significantly up-regulated in NSCLC tissues compared with their corresponding non-tumorous tissues. And ectopic miR-24 expression promoted NSCLC cell migration and invasion by targeting ZNF367 (14). Compared with the paired normal tissues, miR-24 was increased in the hepatocellular carcinoma tissues (15). It was reported to promote HCC cell proliferation and migration and decrease cell apoptosis rates (16). In breast cancer, miR-24-3p was increased in patients with metastases, both in plasma and in patient tissues. And patients whose primary tumors expressed high levels of miR-24-3p showed a significantly lower survival rate compared to patients with low miR-24-3p levels in the TCGA (The Cancer Genome Atlas Program) cohort (17). MiR-24 was found to reduce breast cancer cell apoptosis, cleaved caspase-3 and the expression of p27 (18). In NPC, miR-24 was expressed significantly lower in NPC metastatic tumors, and its higher expression was associated with longer progression-free and metastasis-free survival durations. It could suppress NPC cell proliferation, invasion and migration via targeting c-Myc and then regulating epithelial-mesenchymal transition (EMT), indicating that miR-24 might be used as a prognostic factor and as a novel target for the prevention of NPC metastasis (19). In colorectal cancer, miR-24-1-5p could decrease cell proliferation and migration by repressing β-catenin expression, indicating its role as a tumor suppressor in CRC (20). However, another study showed that miR-24 was overexpressed in NK (natural killer) cells from CRC patients, compared with healthy volunteers. And overexpression of miR-24 suppressed secretions of IFN-γ (interferon-γ) and TNF-α (tumor necrosis factor-α) by targeting Paxillin, suggesting its role as an oncogene (21). This phenomenon might due to the different target of the same miRNA in the specific environment, even in the same cancer type. In laryngeal squamous cell carcinoma, miR-24 acted as an oncogene by promoting LSCC cell proliferation through regulating p27 (22). In esophageal squamous cell carcinoma, a previous study has reported that the level of serum miR-24 in ESCC patients is 4.82 times as high as that in healthy subjects (23). Recently, another study also showed that miR-24 was up-regulated in ESCC, reconfirming its role being as a prognostic biomarker for ESCC (12).

Several clinical evidences have supported the idea that dysregulation of miR-24 is correlated with the clinical features of human cancer. Therefore, the role of miR-24 in human cancer has been explored by numerous clinical, translational, and basic studies. The increasing amount of scientific evidence has confirmed the therapeutic relevance and the biological role of miR-24 in human cancer, for which a critical review is necessary. In the present review, we will summarize the recent advances in the research of miR-24 and provide an overview of its double roles in human cancers. We'll also comprehensively highlight the biological roles of miR-24 in carcinogenesis, cancer progression, metastasis, and drug resistance and discuss the potential application of miR-24 as a diagnostic tool and therapeutic target in human cancers.

Therapeutic Relevance of miR-24 In Cancer

Aberrant miR-24 Expression in Cancer

The expression pattern of miR-24 has been extensively studied, by comparing the tumor and non-tumor tissues of human cancer (Table 1). The up-regulation or down-regulation of miR-24 has been found in the specific cancer type. On the one hand, compared with normal tissues, miR-24 was found to be up-regulated in the following human cancers: lung cancer (LC) (6, 44, 45), hepatocellular carcinoma (HCC) (7), breast cancer (BC) (8), tongue squamous cell carcinoma (TSCC) (42), bladder cancer (BLC) (46), gastric cancer (GC) (47), acute leukemia (AL) (48), and Hodgkin Lymphoma (HL) (49). On the other hand, miR-24 was found to be down-regulated in the following human cancers: nasopharyngeal carcinoma (NPC) (9), colorectal cancer (CRC) (10), laryngeal squamous cell carcinoma (LSCC) (11), prostate cancer (PC) (27, 28), lung adenocarcinoma (LA) (29, 30), bladder cancer (BLC) (31), and gastric cancer (GC) (32), compared to the normal tissues. Specifically, miR-24 promoted lung cancer progression by regulating the tumor suppressor gene menin (45). While miR-24 was downregulated in both lung adenocarcinoma tissues and cells, and it suppressed the proliferation and migration of LA cells by regulating fibroblast growth factor receptor 3 (FGFR3) (30). Therefore, miR-24 was expressed differentially in different type of cancers, with opposite roles as an oncogene or a tumor suppressor.

TABLE 1
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Table 1. Dysregulation and mechanism of miR-24 in different types of human cancer.

Clinical Relevance of miR-24 in Cancer

A variety of findings have confirmed that dysregulation of miR-24 is related to the clinical performance of human cancer. Some studies found that the expression of miR-24 in cancer tissues, being as an oncogene, was correlated with a later clinical stage, as well as the extent of metastasis (53). For example, miR-24-3p was discovered to be down-regulated in CRC tissues compared with their corresponding non-cancerous tissues, and its expression was associated with local invasion (P = 0.002), lymph node metastasis (P = 0.0007) and clinical stage (P < 0.001) significantly (10). Another report found that the ratio of miR-21/24 was significantly correlated with the tumor size, TNM (tumor, lymph node, and metastasis) stage, lymph metastasis and histologic differentiation of CRC (54). The above two studies showed that miR-24 could be used as a potential prognostic biomarker and survival risk factor for CRC patients. MiR-24 was found to be significantly associated with survival of patients with glioblastoma (GBM) multiforme, and promoted GBM progression by targeting tumor suppressor sex-determining region Y-box 7 (SOX7) (55, 56). MiR-24 was obviously overexpressed in lung carcinoma tissues than that of para-cancerous tissues. And the overall survival (OS) of patients with higher miR-24 expression was remarkably shorter than those with lower expression. They further proved that miR-24 promoted the viability, proliferation and cell cycle of lung carcinoma cells and inhibited cell apoptosis by binding to MAPK7 (mitogen-activated protein kinase 7) (57). In tongue squamous cell carcinoma, a double role of miR-24 was discovered relating to its role in clinic. A study reported that the decrease of miR-24 expression was correlated with high grade and late stage tumor in TSCC (42). Nevertheless, another study reported that miR-24 was increased in both TSCC tissues and cell lines, and the increase of miR-24 expression was associated with advanced clinical stage and a shorter overall survival of TSCC patients (43). In total, these evidences suggest the significance of miR-24, in terms of its correlation with the staging and survival of patients with cancer, being as a potential prognostic biomarker for human cancer.

miR-24 as a Diagnostic and Prognostic Marker in Cancer

The differential expression of miR-24 in body fluid such as plasma, alone or in combination with a panel of other miRNAs, makes it might be considered as a potential non-invasive marker in cancer diagnosis. Since miRNAs are related to the clinic, detecting and monitoring the dysregulated miRNAs could reveal the stage of cancer. There are many evidences revealed the diagnostic role of miR-24 in cancers (58). Meng et al. (59) found that serum miR-24-3p could discriminate HCC patients from chronic liver disease (CLD), with an AUC (area under the ROC curve) of 0.636 [95% confidence interval (CI) 0.524–0.748]. And the combination of serum miR-24-3p and AFP (alpha fetoprotein) could improve the diagnostic accuracy for HCC, compared to each biomarker alone. Zhu et al. (33) reported that the differentially expressed circulatory plasma miR-24-3p together with miR-425-5p, miR-1180-3p, miR-122-5p, and miR-4632-5p could be considered as a novel potential biomarker panel for the diagnosis of early gastric cancer. Fang et al. (60) identified a panel of plasma miRNAs, including miR-24, could be a helpful diagnostic marker for colorectal carcinoma detection, especially for its early stage. This is superior to the currently used clinical biomarkers for CRC detection, such as carcino-embryonic antigen (CEA) and carbohydrate antigen19-9 (CA19-9) (60). Fredsoe et al. (61) validated a previously identified 3-miRNA diagnostic ratio model, (miR-222-3p*miR-24-3p/miR-30c-5p) for prostate cancer in cell-free urine. A panel of plasma miRNAs, including miR-24, was validated as a diagnostic biomarker for childhood acute lymphoblastic leukemia detection (62). A study found that miR-24-3p had excellent diagnostic accuracy for oral squamous cell carcinoma [(AUC) = 0.738; P = 0.02], thus salivary exosomal miR-24-3p could be a potential novel diagnostic biomarker for OSCC (50). In total, the above evidences confirmed the role of miR-24 being as a diagnostic marker in human cancer.

Regarding the differential expression of miR-24 in human cancer, miR-24 is associated with patient survival, indicating it could be a potential prognostic biomarker in cancer. Franchina et al. (6) found that circulating miRNAs including miR-22, miR-24, and miR-34a could function as novel predictive biomarkers to pemetrexed-based chemotherapy in advanced non-small cell lung cancer. Researchers discovered that the elevation of serum miR-24-3p could be an independent poor prognostic factor for OS and DFS (disease free survival) of HBV (hepatitis B virus)-related HCC patients (59). And in acute leukemia, Kaplan-Meier analysis showed that AL patients with high miR-24 expression tended to have shorter overall survival, and in the multivariate analysis stratified for known prognostic variables, miR-24 was identified as an independent prognostic marker (48). In contrast, CRC patients with low miR-24-3p level had a significantly poorer prognosis than those with high miR-24-3p level. And multivariate analysis revealed that miR-24-3p could be an independent prognostic indicator for OS of CRC patients (10). In breast cancer, miR-24 was identified to be highly predictive of early breast cancer relapse (38). In nasopharyngeal carcinoma, a survey proved that exosomal miR-24-3p could serve as a prognostic biomarker, due to its involvement in tumor pathogenesis by mediating T-cell inhibition (25). And our previous study validated that miR-24 could serve as a prognostic marker for NPC recurrence (24). Therefore, miR-24 is a potential promising diagnostic and prognostic marker in human cancer.

Biological Role of The miR-24 In Human Cancer

Carcinogenesis and Progression

miR-24 is involved in the initiation and progression of human cancer by regulating the specific gene. On the one hand, miR-24 promotes tumorigenesis in some cancer types. Zhang et al. (63) reported that miR24-1-5p promoted tumorigenesis in ovarian epithelial cells. And hsa-mir-24-2 has been validated to be associated with the metastasis of cervical squamous cell carcinoma (64). In lung squamous cell carcinoma, miR-24-3p was overexpressed and functioned as an onco-miR (51). In mesothelioma, miR-24-3p promoted tumorigenesis by inducing cancer cell growth and regulating Rho-GTP activity positively (65). In hepatocellular carcinoma, miR-24-3p increased cancer cell viability and reduced its cell apoptosis (15). And miR-24 increased cell metastasis and invasion by targeting p53 (7). In lung cancer, miR-24 promoted cancer cell growth and metastasis and inhibited cell apoptosis also by targeting menin, and SOX7 (sex-determining region Y-box 7) (44, 45). In colorectal cancer, a study showed that HIF-1α (hypoxia inducible factor-1α)-induced miR-23a~27a~24 cluster could promote cancer progression via reprogramming its metabolism (66), suggesting miR-24 might be an onco-miR in CRC. Although a previous study showed that miR-24-3p functioned as a tumor suppressor in CRC (10). Whether miR-24 functioned as a tumor suppressor or an onco-miR, in different cancer types, or even in the same cancer type, depends on its different targets. By targeting specific targets, miR-24 could suppress or promote cancer cell proliferation, metastasis, angiogenesis, autophagy, cell cycle, and cell apoptosis. MiR-24-3p mediated the tumorigenesis promotion and accelerated xenografted tumor growth of breast cancer (39, 40). As shown in Figure 1, overexpressing miR-24-3p promoted cell proliferation and inhibited cell apoptosis in breast cancer by targeting p27Kip1 (8, 18). In tongue squamous cell carcinoma, miR-24 promoted its proliferation, migration and invasion through targeting FBXW7 (F-box and WD repeat domain containing 7) (43). In cholangiocarcinoma, miR-24 increased cancer cell proliferation, angiogenesis, migration, and invasion by regulating menin (67). In bladder cancer, miR-24-3p increased cell proliferation and migration ability by targeting DEDD (Asp-Glu-Asp-Asp domain) (46).

FIGURE 1
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Figure 1. Role of miR-24 in cancer initiation and progression. MiR-24 functioned as a tumor suppressor or an onco-miR, in different cancer types, even in the same cancer type, by targeting different targets. By targeting specific targets, miR-24 could suppress or inhibit cancer cell proliferation, metastasis, angiogenesis, autophagy, cell cycle, and cell apoptosis. The pink ellipse means the protein in it functions as an onco-protein, and the blue ellipse means the protein in it functions as a tumor suppressor. p27Kip1, a key protein in regulating cell cycle; FBXW7, F-box and WD repeat domain containing 7, a substrate-recognition subunit of a ubiquitin ligase complex; menin, the protein product of the MEN1 gene, a ubiquitously expressed protein that lacks homology with other protein families; DEDD, Asp-Glu-Asp-Asp domain, a death effector domain-containing protein; CARM3, CARD-containing MAGUK protein 3, a scaffold protein known to activate NF-κB pathway; FGFR3, fibroblast growth factor receptor 3; XIAP, X-linked inhibitor of apoptosis protein; FSCN1, fascin actin-bundling protein 1, a protein encoded by an actin-bundling protein, FSCN1, which is involved in formation of actin-based structures that contribute to cell migration.

On the other hand, however, miR-24 suppresses tumorigenesis in some human cancers. For example, miR-24 was significantly downregulated in gastric cancer tissues compared with matched non-tumor tissues, and it was associated with tumor differentiation (32). In CRC, miR-24-3p suppressed cancer cell proliferation, cell migration and invasion, functioning as a tumor suppressor (10). And miR-24-1-5p decreased CRC cell proliferation, migration and survival significantly by repressing β-catenin expression (20). Ectopic expression of miR-24 inhibited cell cycle, proliferation, migration, and clonogenic potential of prostate cancer cells, as well as inducing cell apoptosis (27). In pancreatic ductal adenocarcinoma (PDA), miR-24-3p exerted its anti-cancer role by suppressing the expression of Laminin Subunit Beta 3 (LAMB3), an oncogene (34). In retinoblastoma, miR-24 plays a tumor suppressive role by targeting c-Myc (35). Moreover, even in the same type of cancer, miR-24 functions oppositely. For example, in colorectal cancer, overexpression of miR-24-1-5p significantly repressed β-catenin expression, and simultaneously decreased CRC cell migration (20). Michael et al. (68) also confirmed that miR-24 inhibited the cell growth of both lung and colon carcinoma. As shown in Figure 1, in bladder cancer, another study reported that miR-24 inhibited cell proliferation, arrested cell cycle and induced cell apoptosis by targeting CARMA3 (CARD-containing MAGUK protein 3) (31). And In lung adenocarcinoma, miR-24-3p could suppress cell proliferation, migration, and invasion by regulating FGFR3 directly (30). In acute lymphoblastic leukemia, miR-24-3p induced cell apoptosis by regulating XIAP (X-linked inhibitor of apoptosis protein) (69). In NPC, miR-24 suppressed cell prolifearation, migration, and invasion and increased the readiosensitivity of cells to iridiation by targeting SP1 (specificity protein 1), FSCN1 (fascin actin-bundling protein 1), and Jab1 (Jun activation domain-binding protein 1), respectively, funcioning as a tumor suppressor (9, 24, 26). Therefore, both positive and negative roles of the miR-24, in cancer cell maintenance, were found in different kinds of cancer, even in the same cancer type (Figure 1).

Cancer Therapy Resistance

MiR-24 not only plays a crucial in tumor initiation and progression, but also plays an essential role in cancer therapy, including chemo- and radio- therapies. Drug resistance limits the efficacy of chemotherapy in human cancers. For the role of miR-24 in cancer chemotherapy, a lot of researchers provided evidences. As shown in Figure 2, in colorectal cancer, some reports showed that miR-24 functioned as a tumor suppressor. It was downregulated in colorectal cancer cells and induced cell apoptosis. What's more, ectopic expression of miR-24 could enhance the chemosensitivity of CRC cells to 5-fluorouracil (5-FU) by targeting RNA-binding protein DND1 (dead end protein 1) (70). In gastric cancer, DND1 was a target of miR-24. And miR-24 overexpression suppressed the migration and invasion of GC. It also enhanced the chemosensitivity of the SNU1 gastric cancer cells (71). In prostate cancer, overexpression of miR-24-3p inhibited survival rate, half maximal inhibitory concentration (IC50) of paclitaxel (PTX) but increased apoptosis in prostate cancer cells after treatment of PTX, via regulating fascin1 (FSCN1) (28). Those researches showed that miR-24 functioned differently after the treatment with chemotherapy, might due to the difference of the specific microenvironment. In human tongue squamous cell carcinoma, miR-24 increased cisplatin resistance by targeting PTEN (phosphatase and tensin homolog) and then acrivating Akt pathway (42). In breast cancer, miR-24-3p functioned as an onco-miR and decreased cisplatin sensitivity by negatively regulating lncRNA (long non-coding RNA) MT1JP (39). Interestingly, another study, published at the same year for the same cancer type, reported that miR-24-3p increased tamoxifen sensitivity by targeting Bim, leading to the induction of breast cancer cell apoptosis, acting as a tumor suppressor (41).

FIGURE 2
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Figure 2. Role of miR-24 in cancer chemo- and radio- therapies. MiR-24 increased 5-FU sensitivity in both colorectal and gastric cancers. However, miR-24 decreased cisplatin sensitivity in both TSCC and breast cancer. Especially, in breast cancer, miR-24 enhanced tamoxifen senstitivy by targeting Bim. And miR-24 increased sensitivity of cancer cells to radiotherapy, and showed a dual role in chemotherapy. By targeting different targets, miR-24 increased radio-sensitivity in NPC, EC and LSCC. The pink ellipse means the protein in it functions as an onco-protein, and the blue ellipse means the protein in it functions as a tumor suppressor. DND1, dead end protein 1, a RNA-binding protein; FSCN1, fascin actin-bundling protein 1, a protein encoded by an actin-bundling protein, FSCN1, which is involved in formation of actin-based structures that contribute to cell migration. PTEN, phosphatase and tensin homolog, a well-known inhibitor of PI3K/Akt pathway; XIAP, X-linked inhibitor of apoptosis protein; FERMT1, also known as KINDLIN-1, is a FERM domain containing adaptor protein that is found predominantly at cell-extracellular matrix adhesions where it binds to integrin β subunits and is required for efficient integrin activation; SP1, specificity protein 1; Jab1, Jun activation domain-binding protein 1, an onco-protein.

For the role of miR-24 in radiotherapy, Xu et al. (11) showed that miR-24 could increase LSCC radio-sensitivity through enhancing irradiation-induced apoptosis. As shown in Figure 2, in laryngeal squamous cell carcinoma, miR-24 was identified to suppress tumor growth, induce cell apoptosis, and reverse cancer cell radioresistance via targeting XIAP (11). In esophageal cancer, miR-24 could also increase its radio-sensitivity by suppressing FERMT1 (also known as KINDLIN-1) (36). Kang et al. (9) and we previously reported that miR-24 enhanced radio-sensitivity of NPC by targeting SP1, and Jab1 (9, 24). Totally, miR-24 plays a crucial role in the radio- and chemo- therapies of cancer (Figure 2).

Discussion

Non-coding RNAs (ncRNAs) are important regulators of gene expression in both physiological and pathological conditions, which is critical to finalize the pharmacological application of ncRNAs as either therapeutic tools or as molecular biomarkers in human cancer (72). In the present review, we summarized that miR-24 had opposite functions, even in the same type of cancer (32, 47). Firstly, this could be probably due to the inconsistent quality of the studies. Therefore, further large studies are needed to confirm these results, and quality control should be highlighted in future investigations of miR-24 in order to produce consistent and reliable conclusions. Secondly, this could be probably due to the complex regulation network of miR-24. Though miR-24 has promising diagnostic and prognostic value for a variety of human cancers, and its roles in cancer progression suggest that it can be a useful biomarker for therapy, its clinical application remains rare. This is mainly because its toxicity and safety remain unclear. Therefore, further studies are needed to confirm its functions and adverse effects.

Conclusions

This review highlighted the scientific achievements in the study of miR-24 in human cancer and outlined the biological and clinical insights on the advancements. MiR-24 has been detected as being differentially expressed across different types of cancer, and might predict the survival and treatment response of cancer patients. Its biological functions covered the scenarios of carcinogenesis, cancer progression, metastasis, and drug resistance, suggesting that it might have potential to be used as an emerging targetable entity in cancer treatment. Throughout the present review, we conclude that “microRNA-24 in cancer: a double side medal with opposite properties.”

Author Contributions

SW was responsible for writing and editing the manuscript. NL was responsible for collecting references and writing the manuscript. QT and HS collected some references. SL and WW were responsible for modifying the manuscript. All authors contributed to the article and approved the submitted version.

Funding

This work was supported by grants from the Chinese medicine science and technology research project of Guangdong Provincial Hospital of Chinese Medicine (YN2019QJ06 and YN2016QJ03), the Guangdong medical science and Technology Research Foundation (A2018251), the Key Top-ranking Discipline Projects of Guangzhou University of Chinese Medicine (A1260619111001), the Guangdong Provincial Key Laboratory of Clinical Research on Traditional Chinese Medicine Syndrome (ZH2020KF03), and Science and Technology Planning Project of Guangdong Province (2017B030314166).

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Abbreviations

miR-24, microRNA-24; miRNAs, microRNAs; HCC, hepatocellular carcinoma; NSCLC, non-small cell lung cancer; BC, breast cancer; NPC, nasopharyngeal carcinoma; CRC, colorectal cancer; LSCC, laryngeal squamous cell carcinoma; ESCC, esophageal squamous cell carcinoma; WWOX, WW domain-containing oxidoreductase; TCGA, The Cancer Genome Atlas Program; EMT, epithelial-mesenchymal transition; NK, natural killer cell; IFN-γ, interferon-γ; TNF-α, tumor necrosis factor-α; LC, lung cancer; TSCC, tongue squamous cell carcinoma; BLC, bladder cancer; GC, gastric cancer; AL, acute leukemia; HL, Hodgkin Lymphoma; PC, prostate cancer; LA, lung adenocarcinoma; FGFR3, fibroblast growth factor receptor 3; OSCC, oral squamous cell carcinoma; LSCC, lung squamous cell carcinoma; PAC, pancreatic cancer; PDA, pancreatic ductal adenocarcinoma; RB, retinoblastoma; EC, esophageal cancer; TNM, tumor, lymph node, and metastasis; GBM, glioblastoma; OS, overall survival; MAPK7, mitogen-activated protein kinase 7; CLD, chronic liver disease; AUC, area under the ROC curve; CI, confidence interval; AFP, alpha fetoprotein; CEA, carcino-embryonic antigen; CA-199, carbohydrate antigen19-9; DFS, disease free survival; HBV, hepatitis B virus; DEDD, Asp-Glu-Asp-Asp domain; FBXW7, F-box and WD repeat domain containing 7; SOX7, sex-determining region Y-box 7; HIF-1α, hypoxia inducible factor-1α; XIAP, X-linked inhibitor of apoptosis protein; LAMB3, Laminin Subunit Beta 3; SP1, specificity protein 1; FSCN1, fascin actin-bundling protein 1; Jab1, Jun activation domain-binding protein 1; CARMA3, CARD-containing MAGUK protein 3; FERMT1, also known as KINDLIN-1; PTEN, phosphatase and tensin homolog; lncRNA, long non-coding RNA; 5-FU, 5-fluorouracil; DND1, dead end protein 1; IC50, half maximal inhibitory concentration; PTX, paclitaxel; ncRNAs, non-coding RNAs.

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Keywords: miR-24, cancer, initiation, progression, biomarker

Citation: Wang S, Liu N, Tang Q, Sheng H, Long S and Wu W (2020) MicroRNA-24 in Cancer: A Double Side Medal With Opposite Properties. Front. Oncol. 10:553714. doi: 10.3389/fonc.2020.553714

Received: 20 April 2020; Accepted: 07 September 2020;
Published: 02 October 2020.

Edited by:

Qingxin Mu, University of Washington, United States

Reviewed by:

Michele Caraglia, University of Campania Luigi Vanvitelli, Italy
Roger Leng, University of Alberta, Canada

Copyright © 2020 Wang, Liu, Tang, Sheng, Long and Wu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Sumei Wang, wangsumei198708@163.com orcid.org/0000-0002-2011-4019; Shunqin Long, thinkinglong@126.com; Wanyin Wu, wwanyin@126.com

These authors have contributed equally to this work

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.